Venetian Blind Positioning Device Cam Disk Mechanism
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Solution Overview
Problem
Existing venetian blind systems require complex constructions to transition from a working position to a closed position without lift tapes, making it difficult to manage the slats' inclination and darkness control.
Innovation Solution
An adjusting device with a cam disk and pick-up lever mechanism, coupled to a drive shaft via a leaf spring, allows for simple activation and deactivation of the working position without elevator belts, using a compact mechanical counter with three cam discs to specify the absolute lowering position of the curtain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If complex constructions are used to transition from working position to closed position without lift tapes, then the slats' inclination can be controlled, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical constructions with a cam disk mechanism that uses geometric profiles to control the transition between working position and closed position. The cam disk's profiled surface automatically guides the pick-up lever through the necessary movements, eliminating the need for complex linkages or multiple actuators while maintaining precise control over slat inclination.
Solution Approach 2:
The invention changes the control parameter from complex mechanical positioning to simple rotational position of the cam disk. By varying the angular position of the cam disk, the system transitions between different operational states (working position, closed position, and intermediate positions), simplifying the control mechanism while maintaining functionality.
2Measurement precision
If additional electrical installations are added for controlling blind positions, then precise darkness management is achieved, but the device complexity and cost increase
Solution Approach 1:
The cam disk mechanism is self-actuating through the rotational motion of the drive shaft. As the drive shaft rotates to change the blind's position, the cam disk's profiled surface automatically engages the pick-up lever, which in turn controls the intermediate stop and the turning mechanism. This eliminates the need for separate electrical actuators, sensors, or control electronics while maintaining precise control over the slats' inclination and darkness management.
3Measurement precision
If a compact mechanical counter with three cam discs is used to specify absolute lowering position, then positioning precision is improved, but the device complexity increases
Solution Approach 1:
The positioning function is segmented into three independent cam disks, each responsible for a specific aspect of position control. The three cam disks work in combination to provide absolute positioning information, with each cam disk's profile contributing to the overall positioning precision. This segmentation allows for modular design and easier manufacturing while achieving high positioning accuracy.
4Adaptability or versatility
If the adjusting device is designed for universal application to standard turning mechanisms, then adaptability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The adjusting device is designed with universal features that allow it to be adapted to standard turning mechanisms. The cam disk profiles are designed to work with common drive shaft dimensions and mounting configurations. The housing and mounting structure accommodate variations in standard mechanisms, enabling the same adjusting device to be used across different blind models and manufacturers, thereby improving adaptability while managing manufacturing precision through standardized interfaces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy and independent control of the slats' inclination between open and closed positions, allowing for precise darkness management without additional electrical installations, suitable for standard turning mechanisms and various blind lengths.
Implementation Method 1
coupled to a drive shaft via a leaf spring
Implementation Method 2
An adjusting device with a cam disk and pick-up lever mechanism
Implementation Method 3
The turning bodies are usually connected to the drive shaft by means of a wrap-spring clutch
Data Source
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AI summary
The device has a turning device (1) with a movable control member for predetermining an operating position in a housing. A housing of a positioning device (61) is rigidly connected with the housing of the turning device and a change over device that is coupled with a control member of the turning device. The changing over device comprises a shift lever i.e. tap lever (79), where a position of the shift lever is changed by a drive of a venetian blind in a predetermined lowering position of a curtain. A position of the changing over device is changed independent of lifting elements of the blind. An independent claim is also included for a method for activating and deactivating an operating position with a venetian blind by a positioning device.